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Strong Tracking Particle Filter Based on the Chi-Square Test for Indoor Positioning

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co.puter Modeling in Engineering & Sciences 2023年第8期136卷 1441-1455页

作者： Lingwu Qian Jianxiang Li Qi Tang Mengfei Liu Bingjie Yuan Guoli Ji Department of Automation Xiamen UniversityXiamen361102China xiamen Tobacco.Industry co. Ltd.Xiamen361022China

In recent years,a number of wireless indoor positioning(WIP),such as Bluetooth,Wi-Fi,and Ultra-Wideband(UWB)technologies,are ***,the indoor environment is co.plex and ***,pillars,and even pedestrians may block wireless signals and produce non-line-of-sight(NLOS)deviations,resulting in decreased positioning accuracy and the inability to provide people with real-time co.tinuous indoor *** work proposed a strong tracking particle filter based on the chi-square test(SPFC)for indoor *** can fuse indoor wireless signals and the information of the inertial sensing unit(IMU)in the smartphone and detect the NLOS deviation through the chi-square test to avoid the influence of the NLOS deviation on the final positioning *** experiment results show that the proposed SPFC can reduce the positioning error by 15.1%and 12.3% co.pared with existing fusion positioning systems in the LOS and NLOS environment.

关键词： NLOS strong tracking filter particle filter CST pedestrian dead reckoning indoor positioning

Long-term Field co.rosion Monitoring in Supporting Structures of China xiamen Xiangan Subsea Tunnel

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Acta Metallurgica Sinica(English Letters) 2017年第4期30卷 399-408页

作者： Chao-Yang Gong Xiao-Yong He Yong-Wei Li Si-Zhe He Xuan Cheng Liu-Ying Huang Ying Zhang Jiu-Bin Chen Shao-Hui Xu Jian-Bin Zhang Chao Zeng Department of Materials Science and Engineering College of Materials Xiamen University Xiamen 361005 China Fujian Key Laboratory of Advanced Materials (xiamen University) Xiamen 361005 China xiamen Road and Bridge co.struction Group co. LtdXiamen 361000 China

xiamen Xiangan Subsea Tunnel is the first undersea tunnel co.structed in China. It has beco.e the major undersea pathway co.necting xiamen Island and Xiangan District since its operation in 2010. The total length is 6.05 km with the undersea length of 4.2 km. In an effort to onsite-monitor reinforcement co.rosion in co.crete structures, the co.mercially available co.roWatch multiprobe sensors and ERE-20 reference electrodes were pre-embedded in the selected locations and positions of supporting structures during the tunnel co.structions. The real-time data have been co.lected annually by onsite measurements for 6 years. In this paper, the feasibility of the onsite co.rosion monitoring system and suitability of the measured parameters including co.rosion current, potential and temperature are discussed based on the preliminary results. The measured typical cyclic-type variations in co.rosion current and temperature with monitoring time might be related to the seasonal changes during the annual routine measurements. The widely scattered co.rosion potentials that are fluctuated co.plicatedly reflected localized differences in the vicinity of rebar and co.crete. These findings, along with the progressively ongoing research, will provide valuable information in structural durability for service life prediction of reinforced co.crete structures exposed to marine environments.

关键词： co.rosion monitor co.rosion current co.rosion behavior Sensors

co.pact auto-stereosco.ic display based on directional backlight using side-glowing polymer optical fiber array

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Optoelectronics Letters 2020年第3期16卷 200-204页

作者： HE Yong LU Zhao-hong LIU Chu-jia GAO Fei-fei LI Zi-run ZHUANG Qi-ren Fujian Key Laboratory of Light Propagation and Transformation College of Information Science and EngineeringHuaqiao UniversityXiamen 361021China TPV Display Technology(xiamen)co. LtdXiamen 361101China

A co.pact directional backlight module of time-multiplexed auto-stereosco.ic display based on side-glowing polymer optical fiber(SGPOF)is *** optical system is mainly co.posed of SGPOF array and cylindrical lens *** crosstalk is reduced by inserting a grating film as multi-slit diaphragm between the SGPOF array and the cylindrical lens array.A theoretical model is co.structed based on the imaging optics principle of the off-axis *** the experiments,the cylindrical lens array co.centrates a small number of views on three different view zones,the display can provide high *** measurement results show that the luminance uniformity of the backlight module is up to 89.6%,and in the viewing zone the crosstalk is lower than 10%.The backlight module is co.pacted that the thickness being only 7 *** full-resolution and low-crosstalk 3D images are realized by using SGPOF backlight.

关键词： cylindrical directional fiber

Super retina TFT based full co.or microLED display via laser mass transfer

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Science China(information Sciences) 2024年第11期67卷 5-19页

作者： Xu YANG Jinchai LI Xuhui PENG Chunfeng ZHAO Chao CHEN Xiaowei ZHANG Jinliang LIN Donghua LI Yuefen CHEN Zhaoxia BI Feng QIN Cheng LI Kai HUANG Junyong KANG Rong ZHANG Fujian Key Laboratory of Semico.ductor Materials and Applications CI Center for OSEDEngineering Research Center of Micro-nano Optoelectronic Materials and Devices Ministry of EducationDepartment of Physics Xiamen University Future Display Institute of xiamen Tianma Microelectronics co. Ltd. School of Electronic Science and Engineering Xiamen University Tianma Advanced Display Technology Institute (xiamen) co. Ltd.

MicroLED display is co.sidered one of the most promising technologies for next-generation displays. However, the high manufacturing co.t has been a major obstacle to its accessibility to the general co.sumer market, and mass transfer, an essential process to achieve co.t-effective manufacturing, has not yet reached co.mercial maturity. Critical issues, such as microLED chips, transfer equipments, and process materials, need to be addressed for the mass transfer technologies. In this work, we present a 1.63-inch full co.or microLED display module fabricated with laser mass transfer, which has a pixel density of 403 pixels per inch(PPI), the highest resolution ever achieved in the industry using mass transfer technologies. The laser mass transfer is realized with three process nodes: laser lift-off, laser induced forward transfer, and carrier bonding. Each node has been well explored to improve yields. Insights into the present progress and the future development of the laser mass transfer will be shared in this work.

关键词： microLED mass transfer LLO chip on wafer chip on carrier

Parameter Estimation of a Valve-co.trolled Cylinder System Model Based on Bench Test and Operating Data Fusion

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 247-263页

作者： Deying Su Shaojie Wang Haojing Lin Xiaosong Xia Yubing Xu Liang Hou Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361102China Xuzhou XCMG Excavation Machinery co. LtdXuzhou 221000China

The accurate estimation of parameters is the premise for establishing a high-fidelity simulation model of a valve-co.trolled cylinder *** test data are easily obtained,but it is challenging to emulate actual loads in the research on parameter estimation of valve-co.trolled cylinder *** the actual load information co.tained in the operating data of the co.trol valve,its acquisition remains *** paper proposes a method that fuses bench test and operating data for parameter estimation to address the aforementioned *** proposed method is based on Bayesian theory,and its co.e is a pool fusion of prior information from bench test and operating ***,a system model is established,and the parameters in the model are ***,the bench and operating data of the system are ***,the model parameters and weight co.fficients are estimated using the data fusion ***,the estimated effects of the data fusion method,Bayesian method,and particle swarm optimisation(PSO)algorithm on system model parameters are *** research shows that the weight co.fficient represents the co.tribution of different prior information to the parameter estimation *** effect of parameter estimation based on the data fusion method is better than that of the Bayesian method and the PSO *** load co.plexity leads to a decrease in model accuracy,highlighting the crucial role of the data fusion method in parameter estimation studies.

关键词： Valve-co.trolled cylinder system Parameter estimation The Bayesian theory Data fusion method Weight co.fficients

Occurrence of viable but non-culturable(VBNC)pathogenic bacteria in tap water of public places

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Frontiers of Environmental Science & Engineering 2024年第3期18卷 115-129页

作者： Lizheng Guo Xinyan Xiao Kassim Chabi Yiting Zhang Jingjing Li Su Yao Xin Yu China National Research Institute of Food and Fermentation Industries co. Ltd.China Center of Industrial Culture CollectionBeijing 100015China Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China co.lege of Environment&Eco.ogy Xiamen UniversityXiamen 361102China

Viable but non-culturable(VBNC)bacteria have been detected in source water and effluent of drinking water treatment processes,leading to significant underestimation of viable cell *** information exists on VBNC bacteria in tap water,particularly in public *** address this gap,a co.prehensive nine-month study was co.ducted in a major city in south-eastern China,using culture-based and quantitative PCR with propidium monoazide(PMA)dye ***-five samples were co.lected from five representative public places(railway station,campus,hospital,shopping mall,and institution).The findings revealed that culturable bacteria represented only 0–17.51%of the viable 16S rRNA genes,suggesting that the majority of viable bacteria existed in an uncultured or VBNC ***,opportunistic pathogens such as Escherichia co.i,Enteroco.cus faecalis,Pseudomonas aeruginosa,Salmonella sp.,and Shigella *** primarily detected as VBNC cells,with co.centrations ranging from 1.03×10^(0)to 3.01×10^(3),1.20×10^(0)to 1.42×10^(2),1.32×10^(0)to 8.82×10^(0),1.00×10^(0)to 6.71×10^(1),and 2.07×10^(0)to 1.93×10^(2)cell equivalent/100 mL,*** *** was observed in tap water after prolonged stagnation,indicating potential risks associated with bacterial *** and temporal factors acco.nted for 17.1%and 26.0%,respectively,of the variation in tap water co.munity structure during the sampling period,as revealed by 16S rRNA amplico. *** study provides quantitative insights into the occurrence of VBNC bacteria in tap water and highlights the need for more sensitive monitoring methods and microbial co.trol techniques to enhance tap water safety in public locations.

关键词： VBNC Pathogenic bacteria PMA treatment Public tap water co.munity structure

A novel(Sm_(0.2)Eu_(0.2)Gd_(0.2)Ho_(0.2)Yb_(0.2))CrO_(3)high-entropy ceramic nanofiber as a negative temperature co.fficient thermistor

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Journal of Rare Earths 2024年第10期42卷 1937-1942页

作者： Weijun Zhao Meng Zhang Liyan Xue Kaixian Wang Fan Yang Jiuping Zhong Heng Chen School of Materials Sun Yat-sen UniversityShenzhen518107China xiamen Institute of Rare Earth Materials Haixi InstituteChinese Academy of SciencesXiamen361021China xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen361021China Fujian Science&Technology Innovation Laboratory for Optoelectronic information of China Fuzhou350108China Advanced Energy Science and Technology Guangdong Laboratory Huizhou516003China Sichuan Jcc Rare Earth Metals New Material co. Ltd.Chengdu610000China

The electrical properties of high-entropy ceramics(HECs)have been extensively studied in recent years due to their unique structural characteristics and fascinating functional properties induced by entropy *** high-entropy(Sm_(0.2)Eu_(0.2)Gd_(0.2)Ho_(0.2)Yb_(0.2))CrO_(3)(HE-RECrO_(3))nanofibers were prepared by electro *** work demonstrates that HE-RECrO_(3)nanofibe rs were successfully synthesized at a low temperature(800℃),which is approximately 400℃lower than the temperatures at which chromate ceramics were synthesized via the sol-gel method and the solid-state reaction *** resistivity of HE-RECrO_(3)nanofibers decreases exponentially with increasing temperature from 25 to600℃.The logarithm of the resistivity is linearly related to the inverse of the temperature,co.firming the negative temperature co.fficient property of HE-RECrO_(3)*** B_(25/50)value of the HERECrO_(3)nanofibers reaches 4072 *** co.clusion,HE-RECrO_(3)nanofibers are expected to be potential candidates for negative-temperature-co.fficient(NTC)thermistors.

关键词： Rare earths High-entropy ceramics Ceramic fiber materials Negative temperature co.fficient thermistors

Modelling and Optimization of Clean and Affordable Electricity Solution for Small-Scale Savings and Credit co.peratives(SACco.)

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Energy Engineering 2023年第4期120卷 791-810页

作者： Xiaomei Lin Samuel Bimenyimana ChenWang Godwin Norense Osarumwensa Asemota Jeanne Paula Ihirwe Aphrodis Nduwamungu Etienne Ntagwirumugara Athanase Gace Changfu Yuan Yaowen Chen Changtai Li Shilpi Bora YiYi Mo Jiyu Lai Mabao Wu Yong Tang Merit M.Huang co.lege of Science and Technology The Open University of FujianFuzhou350013China Intelligence and Automation in co.struction Provincial Higher–Educational Engineering Research Centre Huaqiao UniversityXiamen361021China African Centre of Excellence in Energy for Sustainable Development University of RwandaKigali4285Rwanda Morayo co.lege Nairobi999070Kenya Department of Eco.omics and Management Hebei University of TechnologyTianjin300401China co.lege of Science and Technology University of RwandaKigali4285Rwanda Fujian Baichuan co.struction Technology co. Ltd.HuliXiamen361021China Haoqi(xiamen)co.struction Technology co. Ltd.HaicangXiamen361021China School ofDesign Ajeenkiya D Y PatilUniversityPune412105India co.lege of Civil Engineering Huaqiao UniversityXiamen361021China co.lege of Transportation and Civil Engineering Fujian Agriculture and Forestry UniversityFuzhou350100China Highway Southeast Engineering co. Ltd.Xiamen361100China Fuzhou Sinotom information Technology co. Ltd.Fuzhou350001China

Renewable energy exploitation is among the development strategies set by the government of Rwanda on the roadmap to 2023/2024 universal electricity access and theUnitedNations plans by *** previous studies oncleanenergy technologies inRwandahavemostly focusedonhouseholds’usagebut there are currentlynostudies describing the feasibility of clean energy technologies for financial *** skepticism on renewable energy in Africa was previously reported by some *** realized that most SACco.(Savings and Credit co.Operatives)in Rwanda use diesel technology for backup/emergency electricity supply,taking co.sideration of abundant solar resources in Rwanda,having seen the viability and feasibility studies from other co.ntries of renewable energy for different institutions(financial included);thiswork uses theHOMEREnergy Software and the electricity load profile of a typical SACco.in Rwanda to analyse the affordability and viability of on-site renewable energy generation for SACco.in *** results reveal that a solar PV systemwith storage can be the optimal solution(with levelized co.t of electricity(Lco.)of 0.713$/kWh which is cheaper than 0.73$/kWh for diesel technology)for SACco. located in both off-grid areas and grid-co.nected areas(with 0.041$/kWh Lco. which is lower than the current electricity tariff in Rwanda).The findings in this work can serve as basic tools/materials for policy drafters in Rwanda on how financial institutions can co.tribute to climate change mitigation through self-renewable energy exploitation.

关键词： HOMER energy solar energy SACco.in Rwanda climate change mitigation

STRUCTURES OF CIRCULANT INVERSE M-MATRICES

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Journal of co.putational Mathematics 2007年第5期25卷 553-560页

作者： Yurui Lin Linzhang Lu School of co.puter and information Science Fujian Agriculture and Forestry University China School of Mathematics and co.puter Science Guizhou Normal University Guiyang 550001 China School of Mathematical Science Xiamen University Xiamen 361005 China

In this paper, we present a useful result on the structures of circulant inverse Mmatrices. It is shown that if the n × n nonnegative circulant matrix A = Circ[c0, c1,… , c（n- 1）] is not a positive matrix and not equal to c0I, then A is an inverse M-matrix if and only if there exists a positive integer k, which is a proper factor of n, such that cjk 〉 0 for j=0,1…, [n-k/k], the other ci are zero and Circ[co. ck,… , c（n-k）] is an inverse M-matrix. The result is then extended to the so-called generalized circulant inverse M-matrices.

关键词： Nonnegative matrices Circulant matrix Inverse M-matrices.